/*
 * Copyright 2009 Original Author(s)
 * 
 * This file is part of Kommando
 * 
 * Kommando is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Kommando is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Kommando.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kommando.ranking;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

import org.kommando.core.catalog.CatalogObject;
import org.kommando.core.search.Result;
import org.kommando.core.search.ResultComparator;
import org.kommando.core.search.ScoredResult;
import org.kommando.core.search.ranking.StringScorer;
import org.kommando.history.History;

/**
 * 
 * @author Peter De Bruycker
 */
public class ObjectRanker {

    private StringScorer ranker;
    private History history;

    public ObjectRanker(StringScorer ranker, History history) {
        this.ranker = ranker;
        this.history = history;
    }

    public List<Result<CatalogObject>> rankObjects(Set<CatalogObject> objects, String query) {
        List<Result<CatalogObject>> results = new ArrayList<Result<CatalogObject>>();

        for (CatalogObject object : objects) {
            Result<CatalogObject> rankedObject = rank(object, query);
            if (rankedObject != null) {
                results.add(rankedObject);
            }
        }

        Collections.sort(results, new ResultComparator());

        return results;
    }

    protected Result<CatalogObject> rank(CatalogObject object, String input) {
        SortedSet<Integer> indexes = new TreeSet<Integer>();
        float score = ranker.score(object.getName(), input, indexes);

        float rankModifier = history.getRankModifier(object, input);
        score += rankModifier;

        return score > 0 ? new ScoredResult<CatalogObject>(object, score, indexes) : null;
    }
}
